Home
Cooling

BMW Cooling System Parts & Accessories for BMW 3 Series G20 (2019+)

Clear BMW chassis

The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

Sub-Categories

Sort By:

Rein Coolant Hose Metal Connector With Sensor - BMW B58

2X Entries For Our Spin To Win Sweepstakes! We Price Match - Give Us A Call or Chat! With New Sensor!

T#:38789910

Part#: CHK0940

In Stock

$ 53.99 USD

Add to Wish List

Qty

$ 53.99 USD

Add to Wish List

CRP Automotive introduces two upgraded Rein Coolant Hose Metal Connectors (CRP Part Nos. CHU0940 & CHK0940) designed for BMW B58 6-Cyl. 3.0L engines. The CHU0940 includes a high-strength aluminum connector and gasket, while the CHK0940 adds a built-in temperature sensor for easy installation. The CRP Automotive Innovation Council identified the OE plastic connector as a common failure point, often cracking due to repeated thermal cycling and hydrolysis. Hydrolysis, the process of water breaking down plastic or rubber, weakens the material over time, leading to failure. Rein’s upgraded aluminum connectors eliminate these issues, providing enhanced durability and reliability.

Show More Show Less

Junction Heat Hose - 11538606278

T#:36913362

Part#: 11538606278

In Stock

Sale - Save 25% $ 50.99

$ 38.24 USD

Add to Wish List

Qty

Sale - Save 25% $ 50.99

$ 38.24 USD

Add to Wish List

This junction heat hose, made from rubber, is prone to cracking, dry rot, and brittleness over time, often leading to coolant leaks at the front of the engine. Such leaks pose a significant risk to your engine’s health, as rapid coolant loss can cause overheating and severe damage.

Replace your worn or leaking heat hose with this high-quality OE replacement from Bremmen Parts. Engineered for a precise fit and long-lasting performance, this hose ensures a reliable repair and helps protect your engine from potential overheating.

Show More Show Less

Titanium Coolant Bleeder Screw Upgrade

T#:38621407

Part#: BMS-TCBS

In Stock

$ 25.00 USD

Add to Wish List

Qty

$ 25.00 USD

Add to Wish List

Replace your fragile OEM plastic coolant bleeder screw, which is prone to cracking and failure, with a premium titanium upgrade built for strength and style under the hood. Factory plastic components weaken over time due to constant heat cycles, leading to brittleness and potential failure. Our titanium replacement delivers superior durability, being twice as strong as aluminum yet 45% lighter than steel, ensuring unmatched resilience and long-term reliability for your coolant system. More than an upgrade, it’s a must-have for engine longevity. CNC-machined from solid titanium, each screw features a laser-etched Burger Motorsports logo and is hand-burned to create unique color patterns—no two are alike. A heavy-duty replacement O-ring is included for a perfect fit.

Show More Show Less

OEM INA Electronic Thermostat And Coolant Distribution Module - BMW B...

We Price Match - Give Us A Call or Chat!

T#:36201645

Part#: 11538642559

Back Ordered

$ 262.99 USD

Add to Wish List

Qty

$ 262.99 USD

Add to Wish List

Engineered specifically for BMW models, the electronic thermostat and coolant distribution module plays a vital role in the engine’s cooling system, adapting to changing temperatures for superior performance under all driving conditions. Whether on the track or the highway, this module ensures your BMW runs cooler, longer, and more efficiently.

Show More Show Less

Uro - Aluminum Coolant Hose Connector for E9x, and Z4

We Price Match - Give Us A Call or Chat!

T#:37757289

Part#: 11537545890PRMK

In Stock

Sale - Save 5% $ 18.99

$ 17.95 USD

Add to Wish List

Qty

Sale - Save 5% $ 18.99

$ 17.95 USD

Add to Wish List

Aluminum Connector that replaces the OEM brittle Plastic

Engine Oil Cooler

T#:42436716

Part#: 11428583901

Ships in 1 Business Day

Sale - Save 7% $ 49.99

$ 46.34 USD

Add to Wish List

Qty

Sale - Save 7% $ 49.99

$ 46.34 USD

Add to Wish List

Engine oil coolers are critical for keeping oil temperatures in check, preventing premature breakdown and maintaining proper lubrication. When oil gets too hot, it loses viscosity and can't effectively protect vital engine components like bearings—which can lead to serious, even catastrophic, failures. If your oil cooler is damaged or has failed, replacing it is essential to protect your engine and keep everything running smoothly.

Show More Show Less

Silver Auxiliary Coolant Reservoir Cap

2X Entries For Our Spin To Win Sweepstakes!

T#:38128032

Part#: 201-0394-SIL

Ships Jul 10, 2025

$ 99.99 USD

Add to Wish List

Qty

$ 99.99 USD

Add to Wish List

BMW Silver Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
Premium billet aluminum construction – Offers enhanced durability and longevity
Direct replacement design – Secure fit without adhesives or modifications
Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Silver Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

Show More Show Less

BMW Black Auxiliary Coolant Reservoir Cap

2X Entries For Our Spin To Win Sweepstakes!

T#:38128031

Part#: 201-0394-BLK

Ships Jul 10, 2025

$ 99.99 USD

Add to Wish List

Qty

$ 99.99 USD

Add to Wish List

BMW Black Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
Premium billet aluminum construction – Offers enhanced durability and longevity
Direct replacement design – Secure fit without adhesives or modifications
Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Black Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

Show More Show Less

BMW Blue Auxiliary Coolant Reservoir Cap

2X Entries For Our Spin To Win Sweepstakes!

T#:38128029

Part#: 201-0394-BLU

Ships Jul 10, 2025

$ 99.99 USD

Add to Wish List

Qty

$ 99.99 USD

Add to Wish List

BMW Blue Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
Premium billet aluminum construction – Offers enhanced durability and longevity
Direct replacement design – Secure fit without adhesives or modifications
Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Blue Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

Show More Show Less

Select Vehicle

Purpose

Category

Home

Cooling

Brand

Price

Special Offers

Shipping

Free Shipping on orders $49+ (6)